Inverted back plates build

[Gepetto]

So you can have instability in the amplified signal and rail voltage?

Generally in the amplified signal Lee which is sensitive to feedback magnitude and phase. The rail voltage generally won't notice much.

 

[grapplesaw]

Yes a proportional short for AC (but 90 degrees out of phase with the AC voltage) but not for DC Lee. The higher the frequency, the greater the short in the case of parasitic capacitance.

It is nice to be enrolled at King University !!!!

The THD dropped as a result of parasitic nose disappearing so the test equitment seams to work.

 

[laatsch55]

Capacitors giveth stability and capacitors taketh away stability.............kinda like God Eh??

 

[laatsch55]

It is nice to be enrolled at King University !!!!

The THD dropped as a result of parasitic nose disappearing so the test equitment seams to work.

King Technical College and School of Big Ass Amps....

 

[laatsch55]

Generally in the amplified signal Lee which is sensitive to feedback magnitude and phase. The rail voltage generally won't notice much.

Out of phase feedback sounds like a circuit designers nightmare...

 

[Gepetto]

Out of phase feedback sounds like a circuit designers nightmare...

Sort of Lee...on every device I have every used, phase (lag) eventually catches up with you It is more like unexpected feedback is a circuit designer's nightmare. The SPICE model doesn't have it but reality does.

We are mighty philosophical tonight

 

[laatsch55]

Been home with the flu all day, so I tend to get that way after hours alone....

 

[laatsch55]

In my mind I'm still hung up on AC and DC running around the same device, with DC being used to amplify AC and that both of those voltage/current streams going where they are supposed to go.........one of these days it'll make sense....

 

[Gepetto]

In my mind I'm still hung up on AC and DC running around the same device, with DC being used to amplify AC and that both of those voltage/current streams going where they are supposed to go.........one of these days it'll make sense....

Remember the words of Egon..."never cross the streams"

 

[laatsch55]

But mixing them is OK??

 

[laatsch55]

I guess an electron is an electron regardless whether it's riding AC or DC....

 

[Gepetto]

I guess an electron is an electron regardless whether it's riding AC or DC....

Well said Lee...

 

[laatsch55]

Joe, why can't you have a volt/amp and current/amp in the same device?

 

[Gepetto]

Joe, why can't you have a volt/amp and current/amp in the same device?

Not sure I understand your question Lee. Can you rephrase it so I can try to answer you?

If I was to guess I might answer:

You can configure a transistor to be a voltage amplifier if you configure it as common emitter with a resistor to potential in the collector leg and an input stimulus on the base.

You can configure a transistor to be a current amplifier if you configure it as common collector and an input stimulus on the base.

 

[laatsch55]

That was my question entirely, thank you....

 

[Gepetto]

Not sure I understand your question Lee. Can you rephrase it so I can try to answer you?

If I was to guess I might answer:

You can configure a transistor to be a voltage amplifier if you configure it as common emitter with a resistor to potential in the collector leg and an input stimulus on the base.

You can configure a transistor to be a current amplifier if you configure it as common collector and an input stimulus on the base.

The latter configuration is often called 'emitter follower' No voltage gain, all current gain.

 

[Gepetto]

That was my question entirely, thank you....

And you can configure the first configuration to have both voltage and current gain Lee through the proper choice of resistors and transistor devices.

 

[laatsch55]

It was getting clearer until that last post....

 

[Gepetto]

It was getting clearer until that last post....

i should have quit while I was ahead

 

[laatsch55]

Yweblwrs...